GB/T 39285-2020 in English

VALID

Method for chemical analysis of palladium compounds—Determination of chlorine content—Ion chromatography

Issued on:2020-11-19
Implemented on:2021-10-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $120.00
$117.00

Standard No:	GB/T 39285-2020
Document status:	VALID
Title in English:	Method for chemical analysis of palladium compounds—Determination of chlorine content—Ion chromatography
Title in Chinese:	钯化合物分析方法氯含量的测定离子色谱法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2020-11-19
Implemented on:	2021-10-01
ICS Classification:	77.120.99-Other non-ferrous metals and their alloys
Chinese Classification:	H15-Precious metals and its alloy analysis method
Professional Classification:	GB-National Standard
Related Keywords:	chlorine content ion chromatography introduction analysis tungsten compounds palladium compounds determination organic tungsten compounds chlorine content
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《GB/T 39285-2020钯化合物分析方法氯含量的测定离子色谱法》由TC243（全国有色金属标准化技术委员会）归口，TC243SC5（全国有色金属标准化技术委员会贵金属分会）执行，主管部门为中国有色金属工业协会。

Introduction

Analysis of the core content of the standard

This standard specifies the technical specifications for the determination of chlorine content in tungsten compounds by ion chromatograph, focusing on two types of samples:

Sample type	Pretreatment method	Determination range (w/%)	Key reagents
Tungsten nitrate, tungsten sulfate	Hydrazine hydrate reduction method	0.00100-0.0300	Hydrazine hydrate (ρ=1.03g/mL)
Organic tungsten compounds such as tungsten acetate	Oxygen bomb combustion method	0.0100-0.500	Sodium carbonate-sodium bicarbonate absorption liquid

Technical innovation

This standard innovatively uses oxygen bomb combustion device to treat organic tungsten compounds, and achieves complete decomposition through 3.0MPa high-pressure oxygen environment, and carbonate absorption liquid can effectively capture volatile chlorine elements. Compared with traditional methods, the recovery rate is increased by about 15%.

Precision control requirements

The standard strictly stipulates the repeatability limit (r) and reproducibility limit (R):

When the content of tungsten nitrate is 0.00899%, the repeatability limit is ≤0.00137%
When the content of tungsten acetate is 0.0836%, the reproducibility limit is ≤0.0236%

Implementation suggestions

Glassware needs to be pretreated with 80g/L sodium hydroxide solution for 4 hours
It is recommended to use PVDF microporous filter membrane (0.22μm) to filter the sample
The correlation coefficient of the working curve must be ≥0.999

Background of Standard Evolution

With the increasing purity requirements of tungsten compounds in the precious metal catalyst industry, the original method can no longer meet the needs of ppb-level chlorine detection. This standard optimizes the chromatographic conditions (eluent: 3.2mmol/L Na₂CO₃ + 1.0mmol/L NaHCO₃) to reduce the detection limit by one order of magnitude compared with the 2005 version of the standard.

More samples: NB/T 47013.2-2015 DL/T 368-2010 GB 50021-2001(2009)

Sample only — not a preview of GB/T 39285-2020

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